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Goa circuit

a technology of gate driver and array, applied in the field of display, can solve problems affecting display quality, etc., and achieve the effect of avoiding the impact of leakag

Active Publication Date: 2020-10-08
WUHAN CHINA STAR OPTOELECTRONICS TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The solution effectively prevents leakage current and ensures the normal output of the scan signal, enhancing display performance by maintaining the high voltage of the first node and preventing voltage drops caused by noise and coupling at the second node.

Problems solved by technology

Once the noise and coupling occur at the second node, the TFT is prone to leakage, so that the constant low voltage pulls the voltage of the first node down incorrectly, and the output of the normal scan signal cannot be guaranteed, which affects the display quality.

Method used

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Embodiment Construction

[0031]To further explain the technical means and effect of the present invention, the following refers to embodiments and drawings for detailed description.

[0032]Refer to FIG. 1 to FIG. 5. The GOA circuit of the present invention provides comprises: a plurality of cascaded GOA units, each GOA unit further comprising: a forward / backward scan control module 100, an output module 200, a second node control module 300, a first node control module 400, and an output terminal control module 500.

[0033]Referring to FIG. 1, for positive integers N and M, N≥3, in the N-th GOA unit:

[0034]The forward / backward scan control module 100 is configured to control a voltage of a first node Q(N) according to a scan signal G(N−2) of the (N−2)th GOA unit, a scan signal G(N+2) of the (N+2)th GOA unit, a forward scan control signal U2D, and a backward scan control signal D2U.

[0035]The output module 200 is configured to output a scan signal G(N) according to an M-th clock signal CK(M) and the voltage of the...

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Abstract

The invention provides a GOA circuit. The first node control module of the GOA circuit provided by the invention comprises a tenth TFT, an eleventh TFT and a twelfth TFT of N-type TFTs, when the voltage of the first node is high, the gate-to-source voltage difference of the twelfth TFT is the threshold voltage thereof, so that the drain-source voltage difference of the eleventh TFT is also the threshold voltage of the twelfth TFT, thereby making the resistance between the drain of the tenth TFT and the first node is extremely large, which can avoid the impact of leakage current generated by the tenth TFT on the voltage of the first node when the noise and coupling in the second node occurs, and to ensure the normal output of the scan signal.

Description

BACKGROUND OF THE INVENTION1. Field of the Invention[0001]The present invention relates to the field of display, and in particular to a gate driver on array (GOA) circuit.2. The Related Arts[0002]Liquid crystal display (LCD) provides many advantages, such as, thinness, power saving, and no radiation, and has been widely used, such as, LCD TV, mobile phone, personal digital assistant (PDA), digital camera, computer screen or laptop screen.[0003]Most of the LCDs on the market are backlight type LCD, which comprises an LCD panel and a backlight module. Generally, an LCD panel comprises a color filter (CF) substrate, a thin film transistor (TFT) array substrate, a liquid crystal (LC) layer sandwiched between the CF substrate and the TFT array substrate, and a sealant. The operating principle of the LCD panel is to place LC molecules in two parallel glass substrates, with many vertical and horizontal thin wires between the two glass substrates, and the LC molecules are controlled to chan...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): G09G3/36
CPCG09G3/3677G09G3/3696G09G2310/08G09G2310/0283G09G2310/0286G11C19/28
Inventor LI, YAFENGWU, JINFANG
Owner WUHAN CHINA STAR OPTOELECTRONICS TECH CO LTD